After the worst mass shooting in US history at a nightclub in Orlando, presidential hopefuls Hillary Clinton and Donald Trump are clashing over the causes. Conservatives used to be united by their shared attitude to god, guns and gays; confident warriors in an ideological battle with liberals. Orlando is another test for those beliefs. Former speechwriter for US president George W. Bush, and lifelong conservative David Frum, thinks the triumph of Trump proves that the power of conservatism is crumbling. Should Republicans embrace change? And should they even consider embracing Hillary Clinton?